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bekas [8.4K]
3 years ago
11

How many unpaired electrons does calcium have? You may need to draw the orbital filling diagram for the last sublevel that conta

ins electrons.
A) 0
B) 2
C) 4
D) 1
Chemistry
1 answer:
beks73 [17]3 years ago
6 0

Answer:

0

Explanation:

Ca has 20 electrons

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Is condensation an exothermic or endothermic process? Based on Le Cha^telier’s principle, would you predict the vapor pressure o
Irina18 [472]

Explanation:

A process in which water vapor changes into liquid state is known as condensation. As we know that when energy is released in a reaction then it is known as exothermic reaction and when energy is absorbed in a reaction then it is known as endothermic reaction.

As vapors have high energy so, when they change into liquid state then heat energy is released by them. Therefore, condensation is an exothermic reaction.

As per Le Chatelier's principle, any disturbance caused in an equilibrium reaction will tend to shift the equilibrium in a direction away from the disturbance.

So, when there will occur a decrease in temperature then molecules of a gas will come closer to each other. Hence, there will also occur a decrease in vapor pressure of the gas.

7 0
3 years ago
Be sure to answer all parts. Acetone is one of the most important solvents in organic chemistry. It is used to dissolve everythi
Kazeer [188]

Answer:

Half life = 79.67 sec

Explanation:

Given that:

k = 8.7\times 10^{-3}\ s^{-1}

The expression for half life is shown below as:-

t_{1/2}=\frac{\ln2}{k}

Where, k is rate constant

So,  

t_{1/2}=\frac{\ln2}{8.7\times 10^{-3}\ s^{-1}}

t_{1/2}=114.94252\ln \left(2\right)\ sec=79.67\ sec

Half life = 79.67 sec

6 0
3 years ago
How many moles of potassium hydroxide are needed to completely neutralize 1.56 mol phosphoric acid?
frez [133]
3KOH + H₃PO₄ ----> K₃PO₄ + 3H₂O
3 moles 1 mole


3 moles KOH ------ 1 mole H₃PO₄
X moles KOH ------ 1,56 mol
X = 3×1,56
X = 4,68 moles of KOH

:)
7 0
3 years ago
What do you think would happen if a positive ion and a negative ion were close together? (What do opposite charges do?)
viktelen [127]

Answer: opposite charges attract

Explanation:

7 0
3 years ago
A laboratory bottle of helium gas occupies a volume of 2.0 L at 760 mm Hg. Calculate the new pressure if the
Fantom [35]

Answer:

<h2>844.4 mmHg</h2>

Explanation:

The new pressure can be found by using the formula for Boyle's law which is

P_1V_1 = P_2V_2

Since we are finding the new pressure

P_2 =  \frac{P_1V_1}{V_2}  \\

From the question we have

P_2 =  \frac{2 \times 760}{1.8}  =  \frac{1520}{1.8}  \\ =  844.4444...

We have the final answer as

<h3>844.4 mmHg</h3>

Hope this helps you

8 0
3 years ago
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